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smiffy
Member
Joined: 28 Dec 2006
Posts: 77
Location: In the corner on my computer.
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 Posted: Fri May 30, 2008 9:05 pm Post subject: Saw blades |
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| The time has come for me to think about replacing the blades in my mitre saw and table saw. I know that you can get blades that are either negative or positive rake but can someone please explain the difference, and what are the consequences of getting wrong. |
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big-all
Pro Carpenter
Joined: 16 Dec 2006
Posts: 2654
Location: redhill surrey an auld reekie laddie
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| Posted: Fri May 30, 2008 9:34 pm Post subject: |
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finer the the teeth[teeth per inch/circumference]smoother cut but slower feed rate
negative rake laminate cutting
triple chip blades laminate cutting
what do you normaly cut with your saws!!!!
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Last edited by big-all on Fri May 30, 2008 9:39 pm; edited 1 time in total |
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smiffy
Member
Joined: 28 Dec 2006
Posts: 77
Location: In the corner on my computer.
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| Posted: Fri May 30, 2008 9:38 pm Post subject: |
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| Mostly MDF, Ply and a bit of pine. |
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big-all
Pro Carpenter
Joined: 16 Dec 2006
Posts: 2654
Location: redhill surrey an auld reekie laddie
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| Posted: Fri May 30, 2008 9:42 pm Post subject: |
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i go for trend pro blades 80 tooth in my dewalt flip 254mm
and 64 teeth in my slider [8 1/4" 210mm ish]
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fin
Senior Member
Joined: 16 Apr 2008
Posts: 264
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Hoovie
Devon DIYer
Joined: 27 Jul 2007
Posts: 7771
Location: East Devon
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| Posted: Sat May 31, 2008 8:39 pm Post subject: |
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is negative or positive rake something to do with if it cuts on the down or the up?
so you would use a negative rake blade if you wanted to cut laminate without chipping the surface AND the finished surface side is top?
I don't know the answer - just would like to 
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Hitch
Senior Member
Joined: 16 Jan 2006
Posts: 2429
Location: Somerset
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| Posted: Sat May 31, 2008 8:51 pm Post subject: |
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Negative or positive rake is the rake angle of the teeth, compared to the centreline (on a circ saw)
If you like, its how far forward the teeth point, thats positive rake.
Negative, is leant slightly back. For plastics, aluminium etc. Stops the points of the teeth ripping through too fast
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Hoovie
Devon DIYer
Joined: 27 Jul 2007
Posts: 7771
Location: East Devon
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| Posted: Sat May 31, 2008 9:33 pm Post subject: |
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Cheers 
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If you have a son, DO NOT name him after a verb ....
"Neil, Standup. Neil, Standup"
"Which is it, man?" |
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mannop125
Junior Member
Joined: 17 Jun 2008
Posts: 4
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| Posted: Fri Jun 20, 2008 2:18 pm Post subject: |
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| The biggest negative of not getting the right blade is you are putting more stress on your saw. Not only will it ruin or hamper your porject, but it can cause more heat build up in the motor. Always match the blade with the project. If you are cutting pine, you can use a steel blade, but a hard wood such as walnut or oak, you can to use a carbon tip blade. |
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